2 Copyright (c) 2016 Dominik Moritz
4 This file is part of the leaflet locate control. It is licensed under the MIT license.
5 You can find the project at: https://github.com/domoritz/leaflet-locatecontrol
7 (function (factory, window) {
8 // see https://github.com/Leaflet/Leaflet/blob/master/PLUGIN-GUIDE.md#module-loaders
9 // for details on how to structure a leaflet plugin.
11 // define an AMD module that relies on 'leaflet'
12 if (typeof define === 'function' && define.amd) {
13 define(['leaflet'], factory);
15 // define a Common JS module that relies on 'leaflet'
16 } else if (typeof exports === 'object') {
17 if (typeof window !== 'undefined' && window.L) {
18 module.exports = factory(L);
20 module.exports = factory(require('leaflet'));
24 // attach your plugin to the global 'L' variable
25 if(typeof window !== 'undefined' && window.L){
26 window.L.Control.Locate = factory(L);
29 var LocateControl = L.Control.extend({
31 /** Position of the control */
33 /** The layer that the user's location should be drawn on. By default creates a new layer. */
36 * Automatically sets the map view (zoom and pan) to the user's location as it updates.
37 * While the map is following the user's location, the control is in the `following` state,
38 * which changes the style of the control and the circle marker.
41 * - false: never updates the map view when location changes.
42 * - 'once': set the view when the location is first determined
43 * - 'always': always updates the map view when location changes.
44 * The map view follows the users location.
45 * - 'untilPan': (default) like 'always', except stops updating the
46 * view if the user has manually panned the map.
47 * The map view follows the users location until she pans.
50 /** Keep the current map zoom level when setting the view and only pan. */
51 keepCurrentZoomLevel: false,
52 /** Smooth pan and zoom to the location of the marker. Only works in Leaflet 1.0+. */
55 * The user location can be inside and outside the current view when the user clicks on the
56 * control that is already active. Both cases can be configures separately.
57 * Possible values are:
58 * - 'setView': zoom and pan to the current location
59 * - 'stop': stop locating and remove the location marker
62 /** What should happen if the user clicks on the control while the location is within the current view. */
64 /** What should happen if the user clicks on the control while the location is outside the current view. */
68 * If set, save the map bounds just before centering to the user's
69 * location. When control is disabled, set the view back to the
70 * bounds that were saved.
72 returnToPrevBounds: false,
73 /** If set, a circle that shows the location accuracy is drawn. */
75 /** If set, the marker at the users' location is drawn. */
77 /** The class to be used to create the marker. For example L.CircleMarker or L.Marker */
78 markerClass: L.CircleMarker,
79 /** Accuracy circle style properties. */
87 /** Inner marker style properties. */
97 * Changes to accuracy circle and inner marker while following.
98 * It is only necessary to provide the properties that should change.
100 followCircleStyle: {},
103 // fillColor: '#FFB000'
105 /** The CSS class for the icon. For example fa-location-arrow or fa-map-marker */
106 icon: 'fa fa-map-marker',
107 iconLoading: 'fa fa-spinner fa-spin',
108 /** The element to be created for icons. For example span or i */
109 iconElementTag: 'span',
110 /** Padding around the accuracy circle. */
111 circlePadding: [0, 0],
112 /** Use metric units. */
114 /** This event is called in case of any location error that is not a time out error. */
115 onLocationError: function(err, control) {
119 * This even is called when the user's location is outside the bounds set on the map.
120 * The event is called repeatedly when the location changes.
122 onLocationOutsideMapBounds: function(control) {
124 alert(control.options.strings.outsideMapBoundsMsg);
126 /** Display a pop-up when the user click on the inner marker. */
129 title: "Show me where I am",
130 metersUnit: "meters",
132 popup: "You are within {distance} {unit} from this point",
133 outsideMapBoundsMsg: "You seem located outside the boundaries of the map"
135 /** The default options passed to leaflets locate method. */
138 watch: true, // if you overwrite this, visualization cannot be updated
139 setView: false // have to set this to false because we have to
140 // do setView manually
144 initialize: function (options) {
145 // set default options if nothing is set (merge one step deep)
146 for (var i in options) {
147 if (typeof this.options[i] === 'object') {
148 L.extend(this.options[i], options[i]);
150 this.options[i] = options[i];
154 // extend the follow marker style and circle from the normal style
155 this.options.followMarkerStyle = L.extend({}, this.options.markerStyle, this.options.followMarkerStyle);
156 this.options.followCircleStyle = L.extend({}, this.options.circleStyle, this.options.followCircleStyle);
160 * Add control to map. Returns the container for the control.
162 onAdd: function (map) {
163 var container = L.DomUtil.create('div',
164 'leaflet-control-locate leaflet-bar leaflet-control');
166 this._layer = this.options.layer || new L.LayerGroup();
167 this._layer.addTo(map);
168 this._event = undefined;
170 this._link = L.DomUtil.create('a', 'leaflet-bar-part leaflet-bar-part-single', container);
171 this._link.href = '#';
172 this._link.title = this.options.strings.title;
173 this._icon = L.DomUtil.create(this.options.iconElementTag, this.options.icon, this._link);
176 .on(this._link, 'click', L.DomEvent.stopPropagation)
177 .on(this._link, 'click', L.DomEvent.preventDefault)
178 .on(this._link, 'click', this._onClick, this)
179 .on(this._link, 'dblclick', L.DomEvent.stopPropagation);
181 this._resetVariables();
183 this._map.on('unload', this._unload, this);
189 * This method is called when the user clicks on the control.
191 _onClick: function() {
192 this._justClicked = true;
193 this._userPanned = false;
194 this._prevBounds = null;
196 if (this._active && !this._event) {
197 // click while requesting
199 } else if (this._active && this._event !== undefined) {
200 var behavior = this._map.getBounds().contains(this._event.latlng) ?
201 this.options.clickBehavior.inView : this.options.clickBehavior.outOfView;
208 if (this.options.returnToPrevBounds) {
209 var f = this.options.flyTo ? this._map.flyToBounds : this._map.fitBounds;
210 f.bind(this._map)(this._prevBounds);
215 if (this.options.returnToPrevBounds) {
216 this._prevBounds = this._map.getBounds();
221 this._updateContainerStyle();
226 * - activates the engine
227 * - draws the marker (if coordinates available)
233 this._drawMarker(this._map);
235 // if we already have a location but the user clicked on the control
236 if (this.options.setView) {
240 this._updateContainerStyle();
245 * - deactivates the engine
246 * - reinitializes the button
247 * - removes the marker
252 this._cleanClasses();
253 this._resetVariables();
255 this._removeMarker();
259 * This method launches the location engine.
260 * It is called before the marker is updated,
261 * event if it does not mean that the event will be ready.
263 * Override it if you want to add more functionalities.
264 * It should set the this._active to true and do nothing if
265 * this._active is true.
267 _activate: function() {
269 this._map.locate(this.options.locateOptions);
272 // bind event listeners
273 this._map.on('locationfound', this._onLocationFound, this);
274 this._map.on('locationerror', this._onLocationError, this);
275 this._map.on('dragstart', this._onDrag, this);
280 * Called to stop the location engine.
282 * Override it to shutdown any functionalities you added on start.
284 _deactivate: function() {
285 this._map.stopLocate();
286 this._active = false;
288 // unbind event listeners
289 this._map.off('locationfound', this._onLocationFound, this);
290 this._map.off('locationerror', this._onLocationError, this);
291 this._map.off('dragstart', this._onDrag, this);
295 * Zoom (unless we should keep the zoom level) and an to the current view.
297 setView: function() {
299 if (this._isOutsideMapBounds()) {
300 this.options.onLocationOutsideMapBounds(this);
302 if (this.options.keepCurrentZoomLevel) {
303 var f = this.options.flyTo ? this._map.flyTo : this._map.panTo;
304 f.bind(this._map)([this._event.latitude, this._event.longitude]);
306 var f = this.options.flyTo ? this._map.flyToBounds : this._map.fitBounds;
307 f.bind(this._map)(this._event.bounds, {
308 padding: this.options.circlePadding,
309 maxZoom: this.options.locateOptions.maxZoom
316 * Draw the marker and accuracy circle on the map.
318 * Uses the event retrieved from onLocationFound from the map.
320 _drawMarker: function() {
321 if (this._event.accuracy === undefined) {
322 this._event.accuracy = 0;
325 var radius = this._event.accuracy;
326 var latlng = this._event.latlng;
328 // circle with the radius of the location's accuracy
329 if (this.options.drawCircle) {
330 var style = this._isFollowing() ? this.options.followCircleStyle : this.options.circleStyle;
333 this._circle = L.circle(latlng, radius, style).addTo(this._layer);
335 this._circle.setLatLng(latlng).setRadius(radius).setStyle(style);
340 if (this.options.metric) {
341 distance = radius.toFixed(0);
342 unit = this.options.strings.metersUnit;
344 distance = (radius * 3.2808399).toFixed(0);
345 unit = this.options.strings.feetUnit;
348 // small inner marker
349 if (this.options.drawMarker) {
350 var mStyle = this._isFollowing() ? this.options.followMarkerStyle : this.options.markerStyle;
353 this._marker = new this.options.markerClass(latlng, mStyle).addTo(this._layer);
355 this._marker.setLatLng(latlng).setStyle(mStyle);
359 var t = this.options.strings.popup;
360 if (this.options.showPopup && t && this._marker) {
362 .bindPopup(L.Util.template(t, {distance: distance, unit: unit}))
363 ._popup.setLatLng(latlng);
368 * Remove the marker from map.
370 _removeMarker: function() {
371 this._layer.clearLayers();
372 this._marker = undefined;
373 this._circle = undefined;
377 * Unload the plugin and all event listeners.
378 * Kind of the opposite of onAdd.
380 _unload: function() {
382 this._map.off('unload', this._unload, this);
386 * Calls deactivate and dispatches an error.
388 _onLocationError: function(err) {
389 // ignore time out error if the location is watched
390 if (err.code == 3 && this.options.locateOptions.watch) {
395 this.options.onLocationError(err, this);
399 * Stores the received event and updates the marker.
401 _onLocationFound: function(e) {
402 // no need to do anything if the location has not changed
404 (this._event.latlng.lat === e.latlng.lat &&
405 this._event.latlng.lng === e.latlng.lng &&
406 this._event.accuracy === e.accuracy)) {
411 // we may have a stray event
418 this._updateContainerStyle();
420 switch (this.options.setView) {
422 if (this._justClicked) {
427 if (!this._userPanned) {
435 // don't set the view
439 this._justClicked = false;
443 * When the user drags. Need a separate even so we can bind and unbind even listeners.
445 _onDrag: function() {
446 // only react to drags once we have a location
448 this._userPanned = true;
449 this._updateContainerStyle();
455 * Compute whether the map is following the user location with pan and zoom.
457 _isFollowing: function() {
462 if (this.options.setView === 'always') {
464 } else if (this.options.setView === 'untilPan') {
465 return !this._userPanned;
470 * Check if location is in map bounds
472 _isOutsideMapBounds: function() {
473 if (this._event === undefined) {
476 return this._map.options.maxBounds &&
477 !this._map.options.maxBounds.contains(this._event.latlng);
481 * Toggles button class between following and active.
483 _updateContainerStyle: function() {
484 if (!this._container) {
488 if (this._active && !this._event) {
489 // active but don't have a location yet
490 this._setClasses('requesting');
491 } else if (this._isFollowing()) {
492 this._setClasses('following');
493 } else if (this._active) {
494 this._setClasses('active');
496 this._cleanClasses();
501 * Sets the CSS classes for the state.
503 _setClasses: function(state) {
504 if (state == 'requesting') {
505 L.DomUtil.removeClasses(this._container, "active following");
506 L.DomUtil.addClasses(this._container, "requesting");
508 L.DomUtil.removeClasses(this._icon, this.options.icon);
509 L.DomUtil.addClasses(this._icon, this.options.iconLoading);
510 } else if (state == 'active') {
511 L.DomUtil.removeClasses(this._container, "requesting following");
512 L.DomUtil.addClasses(this._container, "active");
514 L.DomUtil.removeClasses(this._icon, this.options.iconLoading);
515 L.DomUtil.addClasses(this._icon, this.options.icon);
516 } else if (state == 'following') {
517 L.DomUtil.removeClasses(this._container, "requesting");
518 L.DomUtil.addClasses(this._container, "active following");
520 L.DomUtil.removeClasses(this._icon, this.options.iconLoading);
521 L.DomUtil.addClasses(this._icon, this.options.icon);
526 * Removes all classes from button.
528 _cleanClasses: function() {
529 L.DomUtil.removeClass(this._container, "requesting");
530 L.DomUtil.removeClass(this._container, "active");
531 L.DomUtil.removeClass(this._container, "following");
533 L.DomUtil.removeClasses(this._icon, this.options.iconLoading);
534 L.DomUtil.addClasses(this._icon, this.options.icon);
538 * Reinitializes state variables.
540 _resetVariables: function() {
541 // whether locate is active or not
542 this._active = false;
544 // true if the control was clicked for the first time
545 // we need this so we can pan and zoom once we have the location
546 this._justClicked = false;
548 // true if the user has panned the map after clicking the control
549 this._userPanned = false;
553 L.control.locate = function (options) {
554 return new L.Control.Locate(options);
558 // leaflet.js raises bug when trying to addClass / removeClass multiple classes at once
559 // Let's create a wrapper on it which fixes it.
560 var LDomUtilApplyClassesMethod = function(method, element, classNames) {
561 classNames = classNames.split(' ');
562 classNames.forEach(function(className) {
563 L.DomUtil[method].call(this, element, className);
567 L.DomUtil.addClasses = function(el, names) { LDomUtilApplyClassesMethod('addClass', el, names); };
568 L.DomUtil.removeClasses = function(el, names) { LDomUtilApplyClassesMethod('removeClass', el, names); };
571 return LocateControl;